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BIOS 252 Final Exam Practice Test Questions and Answers
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BIOS 252 Final Exam Practice Test Questions and Answers
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BIOS 252 Final Exam Practice Test Questions andAnswers
The region of the sarcomere that always contains thin filaments is the
A) Z line.
B) A band.
C) H band.
D) M line.
E) I band. Correct Ans-E
At rest, active sites on the actin are blocked by
A) calcium ions.
B) troponin molecules.
C) tropomyosin molecules.
D) myosin molecules.
E) ATP molecules. Correct Ans-C
, BIOS 252 Final Exam Practice Test Questions and
Answers
Cross-bridges are portions of
A) actin molecules.
B) myosin molecules.
C) tropomyosin molecules.
D) troponin molecules.
E) calcium ions. Correct Ans-B
When a skeletal muscle fiber contracts, A) the zones of overlap get larger.
B) the H bands and I bands get smaller.
C) the Z lines get closer together. D) the width of the A band remains constant.
E) all of the above Correct Ans-E
, BIOS 252 Final Exam Practice Test Questions and
Answers
The following is a list of the events that occur during a muscle contraction. 1. Myosin cross-
bridges bind to the actin.
2. The free myosin head splits ATP.
3. Calcium ion is released from the sarcoplasmic reticulum.
4. The myosin head pivots toward the center of the sarcomere.
5. Calcium ion binds to troponin. 6. The myosin head binds an ATP molecule and detaches
from the actin.
The correct sequence of these events is
A) 3, 5, 1, 2, 4, 6.
B) 1, 4, 6, 2, 3, 5.
C) 1, 3, 5, 4, 6, 2.
D) 5, 1, 4, 6, 2, 3.
E) 3, 5, 1, 4, 6, 2. Correct Ans-E
Which of the following is a recognized function of skeletal muscle?
, BIOS 252 Final Exam Practice Test Questions and
Answers
1) A) guard body entrances and exits
B) maintain posture
C) maintain body temperature
D) produce movement
E) all of the above Correct Ans-E
Nerves and blood vessels that service the muscle fibers are located in the connective tissues
of the
A) myofibrils.
B) sarcolemma.
C) endomysium.
D) sarcomere.
E) perimysium. Correct Ans-E
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